Machine for making metal tubing



(No Model.) I

' .D. A. RITCHIE. MAGHINE FOR MAKING METAL TUBING.

No. 349,748. Patented Sept 28, 1886.

mf m m glfitent No HHTB-LL, granted to me October 27,

UNITED STATES PATENT OFFICE.

DAVID A. RITCHIE, OF OAMBRIDGEPORT, MASSACHUSETTS.

MACHINE oa MAKING METAL TUBING.

SPECIFICATION forming part of Letters Patent No. 349,748, dated September 28, 1886.

Application filed February G, 1886. Serial No. 191,063. (No model.) i

To all whom/it may concern.-

Be it known that 1, DAVID A. RITCHIE, of Cambridgeport, county of Middlesex, and State of Massachusetts, have invented an Improvementin Machines for Making Metal Tubing, of which the following description, in connection with the accompanying drawings,is a speeifica tion, like letters on the drawings representing like parts.

This invent-ion has for its object to provide means whereby a sheet-metal pipe made from a folded strip may be corrugated longitudinally.

This invention is an improvement on the class of machines represented in United States 1885} and my invention consists, essentially, in the combination, with a mandrel over which the tube is formed, of a corrugated horn and a surrounding series of corru gators to act upon the outside of and press the said pipe into the grooves of the horn, as will be described.

Figure 1, in longitudinal section, represents a mechanism which, taken in connection with the mechanism described in my said patent, will enable my invention to be readily understood, and Fig. 2 is a left-hand end view'of the corrugating devices, and the said figure showing an end view of the mandrel, which in cross-section is the same as the crosssection of the pipe which will be drawn thereover.

Referring to the drawings, the mandrel G, the co-operating pairs of pulling-rolls h h n n", and m m, the finger g, which bends down the usual flanged edges of the strip from which the pipe is made, after the flanged edges there of are interlocked, the stand 9, to hold the finger, the flange-bending device 1) on the shaft p, and the extension 1: are all substantially as in my said patent, wherein the said parts are designated by like letters, a completed pipe made-from a strip being delivered from the delivery end of the mandrel. To the delivery end of the mandrel I have attached a solid born or beak, B, it being, as herein shown, screwed into the screw-threaded interior portion of the mandrel. This. horn or beak B, substantially cylindrical at its junction with the mandrel, is beyond that point provided with a series of longitudinal grooves, which preferably gradually increase in depth for some distance beyond the end of the mandrel.

Surrounding the horn or beak is an annular head, B, supported upon the foot 13 The annular head is extendedforward to form a hub, b, and the head carries a series of ears, 1),

to which are pivoted by pivots b a series of I -shown as a screw, the said screw causing the acting faces of the corrugators resting upon the sheet-metal pipe or tube passing between them and the beak or horn, and depressing the surface of the said pipe into the longitudinal spaces or grooves made in the periphery of the beak or horn. As the result of this construction, a circular pipe delivered from the mandrel upon the beak or horn will be delivered from the latter longitudinally corrugated, substantially as shown in Fig. 2, the number of corrugations and their depth depending upon the number of longitudinal grooves made in the beak or horn and upon the number of corrugators or arms 0 which are arranged outside the tube or pipe.

I claim- Y 1. A mandrel to receive a sheet-metal pipe,

combined with a longitudinally-corrugated beak or horn and with a series of corrugators, to operate substantially as described.

2. The mandrel and its attached longitudially-corrugated beak or horn and the head and the series of corrugators arranged about the periphery of the said beak or horn, combined with the series of pressure-regulating devices to regulate the pressure of the corrugators upon the pipe supported by the said- DAVID A. RITCHIE.

Witnesses:

I F. L. EMERY,

BERN. J. NoYEs. 

